ミナミキイロアザミウマの低温耐性 : I.冬期と夏期個体群の低温下での生存期間

概要

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To determine whether Thrips palmi KARNY can overwinter in fields, the survival period of the adults and second instar larvae was investigated at the constant temperatures of 0℃, -5℃ and -10℃, and fluctuating temperatures of -5℃-5℃ (mean temperature, 0℃), respectively. The summer populations were susceptible to the exposure to low temperatures, while the winter populations were more tolerant to the low temperatures. Winter populations were able to tolerate constant temperatures of -10℃ and -5℃ for one day and one week, respectively. Maximum survival period of the overwintering adults and second instar larvae exposed to a constant temperature of 0℃ with egg-plant as food was 11 days and 16 days, respectively, while under the fluctuating temperature conditions, the period was 28 days and 18 days, respectively. Thus, daily temperature fluctuations prolonged the survival period of the overwintering adults at a low temperature. The larvae could not undergo ecdysis or metamorphosis under fluctuating temperature conditions which simulated the changes of the winter air temperature in the fields of Okayama. Consequently, it is suggested that T. palmi may not be able to overwinter under natural conditions in the fields of the southern part of Okayama Prefecture.
日本応用動物昆虫学会の論文
1987-11-25